CN113937736A - Power system fault protection system and protection method - Google Patents
Power system fault protection system and protection method Download PDFInfo
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- CN113937736A CN113937736A CN202111201982.7A CN202111201982A CN113937736A CN 113937736 A CN113937736 A CN 113937736A CN 202111201982 A CN202111201982 A CN 202111201982A CN 113937736 A CN113937736 A CN 113937736A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/226—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for wires or cables, e.g. heating wires
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a power system fault protection system and a protection method. The power system fault protection system comprises overvoltage monitoring equipment, grounding current monitoring equipment, line protection equipment and a processing platform, wherein the overvoltage monitoring equipment, the grounding current monitoring equipment and the line protection equipment are respectively in signal connection with the processing platform, and the overvoltage monitoring equipment, the grounding current monitoring equipment and the line protection equipment are respectively arranged on each equipment. The protection system monitors each device in real time through the overvoltage monitoring device, the grounding current monitoring device and the line protection device, so that on one hand, the fault position can be determined in time when a power fault occurs, the fault type can be found, the fault can be eliminated in the shortest time, and power supply can be recovered; on the other hand, the power failure can be prevented in advance based on the historical voltage/current information, the ground current information, and the operating state information.
Description
Technical Field
The invention relates to the field of power systems, in particular to a power system fault protection system and a protection method.
Background
In the working and running process of a power grid, accidents always occur, such as short circuit of a power transmission line, open circuit of the power transmission line, lightning stroke of the power transmission line, tripping caused by excess load of equipment, damage of power equipment caused by external force damage, power failure of the equipment caused by illegal operation and the like. When a fault occurs in a power grid, large-area power failure can be caused in a transformer substation, on a line or at an equipment end, production of other industries is influenced, and life of people is influenced. Therefore, the fault position is determined as soon as possible, corresponding personnel are instructed to take a proper emergency repair tool to arrive at the site for fault emergency repair as soon as possible, and power supply is recovered, so that the emergency operation is very necessary, and the emergency operation is one of the most important indexes for examining the operation and maintenance management department of a power grid company. Therefore, the electricity protection work is often the first major work of the power department and is the most important.
When a power failure occurs, the failure position is determined as soon as possible, the failure type is found, the failure reason is clarified, the most urgent task of the power department is realized, the failure must be eliminated and the power supply is recovered in the shortest time, and the existing failure positioning and failure judgment method is still incomplete and accurate.
Disclosure of Invention
The invention aims to provide a power system fault protection system and a protection method, and aims to solve the problem that the existing power fault location and fault judgment are not comprehensive and accurate enough.
In order to solve the technical problems, the invention aims to realize the following technical scheme: there is provided a power system fault protection system, comprising:
the system comprises a plurality of devices, a processing platform, an overvoltage monitoring device, a grounding current monitoring device, a line protection device and a transformer substation system, wherein the overvoltage monitoring device, the grounding current monitoring device and the line protection device are respectively in signal connection with the processing platform, and are respectively arranged on each device; wherein the content of the first and second substances,
the overvoltage monitoring equipment is used for acquiring the voltage and current information of the line in real time and sending the voltage and current information to the processing platform;
the grounding current monitoring equipment is used for acquiring line grounding current information in real time and sending the grounding current information to the processing platform;
the line protection equipment is used for conducting and shunting transient overvoltage exceeding normal working voltage and sending working state information to the processing platform in real time;
and the processing platform is used for receiving and recording the voltage and current information, the grounding current information and the working state information, and judging the type and the position of the line fault based on the voltage and current information, the grounding current information and the working state information.
In addition, another technical problem to be solved by the present invention is to provide a protection method for a power system fault protection system, including:
the overvoltage monitoring equipment collects the voltage and current information of the line in real time and sends the voltage and current information to the processing platform;
the grounding current monitoring equipment acquires line grounding current information in real time and sends the grounding current information to the processing platform;
the line protection equipment conducts and shunts transient overvoltage exceeding normal working voltage and sends working state information to the processing platform in real time;
and the processing platform receives and records the voltage and current information, the grounding current information and the working state information, and judges the type and the position of the line fault based on the voltage and current information, the grounding current information and the working state information.
The embodiment of the invention discloses a power system fault protection system and a protection method, wherein the power system fault protection system is used for carrying out power fault protection on a transformer substation system, the transformer substation system is provided with a plurality of devices, the devices comprise overvoltage monitoring devices, grounding current monitoring devices, line protection devices and a processing platform, the overvoltage monitoring devices, the grounding current monitoring devices and the line protection devices are respectively in signal connection with the processing platform, and the overvoltage monitoring devices, the grounding current monitoring devices and the line protection devices are respectively arranged on each device; the overvoltage monitoring equipment is used for acquiring line voltage and current information in real time and sending the voltage and current information to the processing platform; the grounding current monitoring equipment is used for acquiring line grounding current information in real time and sending the grounding current information to the processing platform; the line protection equipment is used for conducting and shunting transient overvoltage exceeding normal working voltage and sending working state information to the processing platform in real time; and the processing platform is used for receiving and recording the voltage and current information, the grounding current information and the working state information, and judging the type and the position of the line fault based on the voltage and current information, the grounding current information and the working state information. The protection system monitors each device in real time through the overvoltage monitoring device, the grounding current monitoring device and the line protection device, so that on one hand, the fault position can be determined in time when a power fault occurs, and the fault type can be found, so that the fault can be eliminated in the shortest time and the power supply can be recovered; on the other hand, the power failure can be prevented in advance based on the historical voltage/current information, the ground current information, and the operating state information.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a power system fault protection system according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a protection method of a power system fault protection system according to an embodiment of the present invention;
fig. 3 is a first sub-flowchart of a protection method of a power system fault protection system according to an embodiment of the present invention;
fig. 4 is a second sub-flowchart of a protection method of a power system fault protection system according to an embodiment of the present invention;
fig. 5 is a third sub-flowchart of a protection method of a power system fault protection system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a power system fault protection system according to an embodiment of the present invention;
as shown in fig. 1, the fault protection system is used for performing power fault protection on a substation system, the substation system is provided with a plurality of devices, including an overvoltage monitoring device, a ground current monitoring device, a line protection device and a processing platform, the overvoltage monitoring device, the ground current monitoring device and the line protection device are respectively in signal connection with the processing platform, and the overvoltage monitoring device, the ground current monitoring device and the line protection device are respectively arranged on each device; wherein the content of the first and second substances,
the overvoltage monitoring equipment is used for acquiring the voltage and current information of the line in real time and sending the voltage and current information to the processing platform;
the grounding current monitoring equipment is used for acquiring line grounding current information in real time and sending the grounding current information to the processing platform;
the line protection equipment is used for conducting and shunting transient overvoltage exceeding normal working voltage and sending working state information to the processing platform in real time;
and the processing platform is used for receiving and recording the voltage and current information, the grounding current information and the working state information, and judging the type and the position of the line fault based on the voltage and current information, the grounding current information and the working state information.
The transformer substation system is characterized in that each transformer substation system is provided with a plurality of switches, a plurality of screen cabinets, a plurality of barrier gates, a plurality of transformers, an incoming line bus, a plurality of outgoing line branch lines and a plurality of electric equipment connected with the outgoing line branch lines through a distribution network line, and the transformer substation system is complex in structure, inconvenient for timely judging fault positions and fault types when power faults occur under the condition that the equipment is in a plurality of numbers, multiple types and multiple positions, and further cannot timely recover power supply. In the embodiment, in the process of power transmission and distribution of the power system, the power system fault protection system can determine the fault position in time when the power fault occurs and judge the corresponding fault type for the reference of maintenance personnel through the real-time detection of the overvoltage monitoring equipment, the grounding current monitoring equipment and the line protection equipment, so that the fault is eliminated and the power supply is recovered in the shortest time; on the other hand, the aging of the monitoring equipment and the protection equipment can be judged in advance according to the historical voltage and current information, the grounding current information and the working state information, and further the power accident can be prevented in advance. The voltage and current information in the embodiment of the present application includes current information and voltage information.
In the power system transmission and distribution process, each equipment can be caused by the faults caused by overvoltage impact, ground short circuit or disconnection, switch misoperation, and impact on the equipment caused by ground potential counterattack, in the embodiment, the overvoltage monitoring equipment is a voltage monitor, the ground current monitoring equipment is a ground monitor, the line protection equipment is a surge protector, and the overvoltage monitor and the ground monitor are installed near each equipment, so that the overvoltage and overcurrent conditions suffered by the equipment are monitored on line, the time, the times, the amplitude and the energy of overvoltage and overcurrent impact suffered by each equipment are recorded in real time, the overvoltage impact invasion path is recorded, and meanwhile, the data of the ground current of each equipment is monitored and recorded in real time. When a fault occurs, according to the recorded data, the characteristics of the fault, such as the occurrence of the fault due to overvoltage impact, grounding short circuit or open circuit, are combined, so that the position of the fault can be quickly positioned, and the type of the fault and the influence range caused by the fault can be determined.
The embodiment of the invention also provides a protection method of the power system fault protection system, which is used for executing any embodiment of the power system fault protection system.
Specifically, please refer to fig. 2, wherein fig. 2 is a flowchart illustrating a protection method of a power system fault protection system according to an embodiment of the present invention.
As shown in fig. 2, the protection method of the power system fault protection system is used for performing power fault protection on a substation system, and includes steps S101 to S104.
S101, the overvoltage monitoring equipment collects line voltage and current information in real time and sends the voltage and current information to the processing platform;
s102, the grounding current monitoring equipment collects line grounding current information in real time and sends the grounding current information to the processing platform;
s103, conducting and shunting the transient overvoltage exceeding the normal working voltage by the line protection equipment, and sending working state information to the processing platform in real time;
and S104, the processing platform receives and records the voltage and current information, the grounding current information and the working state information, and judges the type and the position of the line fault based on the voltage and current information, the grounding current information and the working state information.
In this embodiment, the staff can look over voltage and current information, ground current information and operating condition information through processing platform in real time, processing platform can be automatic according to received current voltage and current information, ground current information and operating condition information simultaneously, the very first time is judged line fault type and fault location and is in order to supply power system maintenance personnel to refer to, maintenance personnel can in time go corresponding trouble place according to the result of processing platform feedback and carry out corresponding maintenance operation to and the time resumes the power supply, effectual maintenance efficiency that has improved.
In a specific embodiment, before the step S101, the method further includes:
s201, establishing a topological structure diagram of each device according to a primary wiring diagram of a transformer substation system and a power transmission line, and generating position information of the overvoltage monitoring device, the grounding current monitoring device and the line protection device based on the topological structure diagram.
In this embodiment, the electrical primary equipment on the power plant system and the transmission line is for example directly used for electrical equipment for producing, transforming, transporting, grooming, distributing and using electrical energy, according to the working requirements and the functions of the electric primary equipment, a circuit formed by connecting the electric primary equipment and the electric secondary equipment in a certain sequence is called an electric main wiring or a primary wiring, the primary wiring shows the production, collection, conversion, distribution relation and operation mode of electric energy and is the basis of operation and circuit switching, a primary wiring diagram generated based on the electric primary equipment is inconvenient to check, and then establishing a corresponding topological structure diagram based on the primary wiring diagram to show the connection relationship between the two devices, wherein model information of the line protection device and position information thereof are associated with installation position information of the device, namely, the position information of the corresponding line protection equipment can be found by searching the installation position information of the equipment. When a power failure occurs, maintenance personnel check the corresponding topology structure chart at the first time, and because the topology relation and the hierarchical relation among the positions of each device are very clear, the failure can be quickly positioned.
Referring to fig. 3, in an embodiment, the step S104 includes:
s301, judging whether a corresponding device has a voltage fault or not based on the current and voltage information, if so, continuing to judge whether the device is provided with the line protection device or not, if so, executing a step S302, and if not, executing a step S303;
s302, judging the fault type to be the damage of the line protection equipment;
s303, continuously determining whether the overvoltage value in the current voltage and current information exceeds a preset overvoltage threshold, if the overvoltage value in the current voltage and current information exceeds the preset overvoltage threshold, executing step S304, and if the overvoltage value in the current voltage and current information does not exceed the preset overvoltage threshold, executing step S305
S304, judging the fault type to be a voltage fault;
and S305, comparing the number of times of overvoltage values in the voltage and current information within the preset time range with a set threshold of the number of times of overvoltage values, if the number of times of overvoltage values in the voltage and current information within the preset time range exceeds the set threshold of the number of times of overvoltage values, determining that the fault type is a voltage fault, and if the number of times of overvoltage values in the voltage and current information within the preset time range does not exceed the set threshold of the number of times of overvoltage values, determining that no voltage fault exists.
In this embodiment, the processing platform may first identify a location source of the current and voltage information based on the received current and voltage information, and then determine whether a voltage fault occurs in the device based on data carried by the current and voltage information, such as a current overvoltage value, if a voltage fault occurs, determine whether a line protection device is installed at the fault location according to a corresponding topology structure diagram, if not, a maintenance worker may install the line protection device at the fault location at the first time, and if a line protection device is installed at the location, it is described that the line protection device may be damaged, and the line protection device needs to be replaced with a new one, and the maintenance worker may go to the fault location at the first time to check and perform corresponding maintenance work, such as replacing the new line protection device, according to an actual situation.
In an actual scenario, a line protection device with corresponding specification parameters is generally configured based on characteristics of a device to be protected, such as an impact withstanding voltage, and since the line protection device is not installed at the fault location before, it cannot be known at the first time what specification parameters of the line protection device should be configured at the location, and thus a maintenance worker can know that the maintenance efficiency is seriously reduced only by actual detection after arriving at the fault location, in this embodiment, a line protection device whose overvoltage value must be greater than the overvoltage value in the fault process is rapidly selected according to a comparison between the overvoltage value in the received current voltage and current information and a preset overvoltage value threshold. Preferably, if the device has multiple voltage faults before maintenance, the processing platform compares the number of times of overvoltage values in the voltage and current information within the preset time range with the set threshold value of the number of times of overvoltage values, and then finally selects the most adaptive line protection device at the fault position, so that the probability of secondary fault occurrence is reduced, and the applicability and the practicability of the protection method are improved.
Referring to fig. 4, in an embodiment, the step S104 further includes:
s401, judging whether a corresponding device has a current fault or not based on the current and voltage information, if the device has the current fault, calculating a numerical value of impact energy according to the voltage and current information, comparing the calculated numerical value of the impact energy with a set impact energy threshold, executing a step S402 if the calculated numerical value of the impact energy is greater than the set impact energy threshold, and executing a step S403 if the calculated numerical value of the impact energy is less than the set impact energy threshold;
s402, judging the fault type to be the performance reduction of the line protection equipment;
and S403, continuously judging whether failure alarm information exists in the working state information of the line protection equipment, and if the failure alarm information exists in the working state information of the line protection equipment, judging that the fault type is that the line protection equipment fails.
In this embodiment, the processing platform further determines whether a current fault occurs in the device based on the current information in the current-voltage information, specifically, calculates a value of impact energy according to the voltage-current information, where in this embodiment, the impact energy is calculated by using the following formula:
E＝I×t
wherein, I is the impact current, and t is the impact duration.
When the calculated impact energy value is smaller than a certain impact energy threshold value, it is indicated that the line protection equipment can work normally and stably, otherwise, it is indicated that the line protection equipment has performance failure, and at this time, the line protection equipment needs to be replaced with new line protection equipment, wherein the performance failure of the line protection equipment is caused by that the line protection equipment has a fixed energy tolerance, and the tolerance is gradually reduced along with the impact of current impact energy, and when the tolerance is reduced to a certain degree, the new line protection equipment needs to be replaced in time. In a specific embodiment, when the remaining tolerance of the line protection device is lower than 20% of the initial tolerance, the line protection device is considered to have a potential performance failure risk, that is, the processing platform in the embodiment of the present application may also predict the damage degree of the line protection device according to the impact energy, so as to timely replace a new line protection device, and avoid a power failure at a relative position due to performance failure of the line protection device.
Referring to fig. 5, in an embodiment, the step S104 further includes:
s501, judging whether the grounding current is 0 or not based on the grounding current information, if the grounding current is equal to 0, executing a step S502, and if the grounding current is not equal to 0, executing a step S503;
s502, judging the fault type to be grounding wire damage;
and S503, comparing the grounding current with a set grounding current threshold, and if the grounding current exceeds the preset grounding current threshold, judging that the fault type is the performance reduction of the grounding wire.
In this embodiment, the processing platform receives the current grounding current information, and determines whether a phenomenon that the grounding current is 0 occurs based on the current grounding current information, for example, if the grounding monitor monitors that the grounding current at a certain position is 0 and continues for a certain set time, it may be determined that the grounding wire at the position is damaged, for example, disconnected. And if the performance of the grounding wire is reduced, the grounding wire is unreliable, and a new grounding wire needs to be replaced to avoid the condition of power failure.
In a specific embodiment, after the step S104, the method includes:
s601, the processing platform generates and displays protection risk analysis data based on the voltage and current information, the grounding current information and the working state information.
In order to clearly check the specific conditions of each device, the processing platform integrates and processes the voltage and current information, the grounding current information and the working state information and generates protection risk analysis data, maintenance personnel can check the protection risk analysis data first, and early warning such as performance failure of line protection equipment is required to be replaced and corresponding operation is carried out on the protection risk analysis data; when a transformer substation system fails, the current protection risk analysis data can be checked at the first time, the fault position and the fault type analyzed by the processing platform can be found, then corresponding maintenance equipment and tools can be carried at the first time to the fault position for maintenance, and the efficiency of power maintenance is effectively improved.
In an embodiment, after the step S601, the method includes:
s701, recording the installation time of the overvoltage monitoring device, the grounding current monitoring device and the line protection device, comparing the installation time of the overvoltage monitoring device, the grounding current monitoring device and the line protection device with a preset service life threshold value, and displaying an early warning signal to the protection risk analysis data if the installation time of the overvoltage monitoring device, the grounding current monitoring device and the line protection device is greater than the preset service life threshold value.
In the actual use process, the overvoltage monitoring equipment, the grounding current monitoring equipment and the line protection equipment all have corresponding service lives, and the number of equipment in a transformer substation system is large, and the equipment is unrealistic through artificial recording and troubleshooting, so the overvoltage monitoring equipment, the grounding current monitoring equipment and the line protection equipment are recorded by the processing platform on the day of self-installation, and after the running time reaches a preset service life threshold value, early warning is sent out on protection risk analysis data, the phenomenon that the overvoltage monitoring equipment, the grounding current monitoring equipment and the line protection equipment are aged is effectively solved, and the occurrence of power failure is further reduced. For example, when the line protection device has a running time of more than 5 years since the date of installation, the line protection device is considered to have a potential protection risk and needs to be replaced.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A power system fault protection system is used for carrying out power fault protection on a transformer substation system, and the transformer substation system is provided with a plurality of devices and is characterized by comprising overvoltage monitoring devices, grounding current monitoring devices, line protection devices and a processing platform, wherein the overvoltage monitoring devices, the grounding current monitoring devices and the line protection devices are respectively in signal connection with the processing platform, and the overvoltage monitoring devices, the grounding current monitoring devices and the line protection devices are respectively arranged on each device; wherein the content of the first and second substances,
the overvoltage monitoring equipment is used for acquiring the voltage and current information of the line in real time and sending the voltage and current information to the processing platform;
the grounding current monitoring equipment is used for acquiring line grounding current information in real time and sending the grounding current information to the processing platform;
the line protection equipment is used for conducting and shunting transient overvoltage exceeding normal working voltage and sending working state information to the processing platform in real time;
and the processing platform is used for receiving and recording the voltage and current information, the grounding current information and the working state information, and judging the type and the position of the line fault based on the voltage and current information, the grounding current information and the working state information.
2. The power system fault protection system of claim 1, wherein the overvoltage monitoring device is a voltage monitor, the ground current monitoring device is a ground monitor, and the line protection device is a surge protector.
3. A protection method of a power system fault protection system according to any one of claims 1-2, for performing power fault protection on a substation system, comprising:
the overvoltage monitoring equipment collects the voltage and current information of the line in real time and sends the voltage and current information to the processing platform
The grounding current monitoring equipment acquires line grounding current information in real time and sends the grounding current information to the processing platform;
the line protection equipment conducts and shunts transient overvoltage exceeding normal working voltage and sends working state information to the processing platform in real time;
and the processing platform receives and records the voltage and current information, the grounding current information and the working state information, and judges the type and the position of the line fault based on the voltage and current information, the grounding current information and the working state information.
4. The protection method of the power system fault protection system according to claim 3, wherein before the overvoltage monitoring device collects the line voltage and current information in real time, the method comprises:
and establishing a topology structure diagram of each device according to primary wiring diagrams of a transformer substation system and a power transmission line, and generating position information of the overvoltage monitoring device, the grounding current monitoring device and the line protection device based on the topology structure diagram.
5. The protection method of the power system fault protection system according to claim 3, wherein the processing platform receives and records the voltage current information, the ground current information and the operating state information, and determines the type and the location of the line fault based on the voltage current information, the ground current information and the operating state information, and comprises:
judging whether the corresponding equipment has voltage faults or not based on the current and voltage information, and if so, continuously judging whether the equipment is provided with the line protection equipment or not;
if the line protection equipment is installed, judging the fault type to be the damage of the line protection equipment;
if the line protection equipment is not installed, continuously judging whether the overvoltage value in the current voltage and current information exceeds a preset overvoltage value threshold value;
if the overvoltage value in the current voltage and current information exceeds a preset overvoltage value threshold, determining that the fault type is a voltage fault;
if the overvoltage value in the current voltage and current information does not exceed the preset overvoltage value threshold, comparing the number of times of the overvoltage value in the voltage and current information within the preset time range with the set overvoltage value number threshold, if the number of times of the overvoltage value in the voltage and current information within the preset time range exceeds the set overvoltage value number threshold, determining that the fault type is a voltage fault, and if the number of times of the overvoltage value in the voltage and current information within the preset time range does not exceed the set overvoltage value number threshold, determining that no voltage fault exists.
6. The protection method of the power system fault protection system according to claim 3, wherein the processing platform receives and records the voltage current information, the ground current information and the operating state information, and determines the type and the location of the line fault based on the voltage current information, the ground current information and the operating state information, and comprises:
judging whether the corresponding equipment has a current fault or not based on the current and voltage information, if the equipment has the current fault, calculating a numerical value of impact energy according to the voltage and current information, comparing the calculated numerical value of the impact energy with a set impact energy threshold value, and if the calculated numerical value of the impact energy is greater than the set impact energy threshold value, judging that the fault type is the performance reduction of the line protection equipment;
if the calculated impact energy value is smaller than the set impact energy threshold value, whether failure alarm information exists in the working state information of the line protection equipment or not is continuously judged, and if the failure alarm information exists in the working state information of the line protection equipment, the fault type is judged to be the failure of the line protection equipment.
7. The protection method of the power system fault protection system according to claim 3, wherein the processing platform receives and records the voltage current information, the ground current information and the operating state information, and determines the type and the location of the line fault based on the voltage current information, the ground current information and the operating state information, and comprises:
judging whether the grounding current is 0 or not based on the grounding current information;
if the grounding current is equal to 0, judging the fault type to be grounding wire damage;
and if the grounding current is not equal to 0, comparing the grounding current with a set grounding current threshold, and if the grounding current exceeds the preset grounding current threshold, judging that the fault type is the performance reduction of the grounding wire.
8. The protection method of the power system fault protection system according to claim 3, wherein the processing platform receives and records the voltage current information, the ground current information and the operating state information, and after determining the type and the location of the line fault based on the voltage current information, the ground current information and the operating state information, the method comprises:
and the processing platform generates and displays protection risk analysis data based on the voltage and current information, the grounding current information and the working state information.
9. The protection method of the power system fault protection system according to claim 8, wherein after the processing platform generates and displays protection risk analysis data based on the voltage current information, the ground current information and the operating state information, the method comprises:
and recording the installation time of the overvoltage monitoring equipment, the grounding current monitoring equipment and the line protection equipment, comparing the installation time of the overvoltage monitoring equipment, the grounding current monitoring equipment and the line protection equipment with a preset service life threshold value, and displaying an early warning signal on the protection risk analysis data if the installation time of the overvoltage monitoring equipment, the grounding current monitoring equipment and the line protection equipment is greater than the preset service life threshold value.
10. The protection method of a power system fault protection system according to claim 6, wherein the impact energy is calculated by the following formula:
E＝I×t
wherein, I is the impact current, and t is the impact duration.
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